VoIP is a technology that utilizes Session Initiation Protocol (SIP) to enable voice communication services, however the two terms VoIP/SIP can be used interchangeably. SIP can be used as a home or office solution depending on the needs of a customer.
SIP offers Direct Exchange Lines (PSTN), as well as Trunking features same as PRI line. Here, Voice channels can be determined by a customer’s needs; some systems can handle up to 254 or more, unlike PRI with defined 30 channels.